Quote Originally Posted by deepak_abc
... But I read many posts that if I chose to install the Boot Loader in the MBR then my system will become unbootable. Neither Windows nor Knoppix will boot. Have you tried your solution out and does it work? ...
I have never had any trouble doing this using Knoppix or DamnSmallLinux for example.
If you did have a problem you can always restore the Windows MBR operation by fdisk /mbr from your Windows disk or e.g. a DOS boot disk.

Quote Originally Posted by deepak_abc
...Rather than reinstalling I should be able to mount the partition, copy the boot loader with dd and copy it on to the MBR.
As a precaution I have to save a copy of the MBR before I overwrite the MBR and restore this copy if something is messed up. Any idea how to do the above things? I am not new to Unix and have tinkered with unix for many years...
I think that you will find you get into much greater complications if you try to do it this way there is more than just copying involved...
If you have a strong reason for keeping your original Knoppix installation on the partition, it would be simpler and more 'future-proof' to use a dedicated Boot Manager.